Calculator



FIG. 1 is a perspective view of a calculator according to our invention.

FIG. 2 is a front side view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a rear side view thereof, the broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a calculator, as shown and described. 